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(#) Cancel/OK dialog button capitalization

!!! WARNING: Cancel/OK dialog button capitalization
   This is a warning.

Id
:   `ButtonCase`
Summary
:   Cancel/OK dialog button capitalization
Severity
:   Warning
Category
:   Usability
Platform
:   Android
Vendor
:   Android Open Source Project
Feedback
:   https://issuetracker.google.com/issues/new?component=192708
Since
:   Initial
Affects
:   Resource files
Editing
:   This check runs on the fly in the IDE editor
Implementation
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-checks/src/main/java/com/android/tools/lint/checks/ButtonDetector.java)
Tests
:   [Source Code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ButtonDetectorTest.java)
Copyright Year
:   2012

The standard capitalization for OK/Cancel dialogs is "OK" and "Cancel".
To ensure that your dialogs use the standard strings, you can use the
resource strings @android:string/ok and @android:string/cancel.

(##) Example

Here is an example of lint warnings produced by this check:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~text
res/values/buttonbar-values.xml:9:Warning: The standard Android way to
capitalize Ok is "OK" (tip: use @android:string/ok instead)
[ButtonCase]
    &lt;string name="resume2"&gt; Ok &lt;/string&gt;
                            --
res/values/buttonbar-values.xml:10:Warning: The standard Android way to
capitalize CANCEL is "Cancel" (tip: use @android:string/cancel instead)
[ButtonCase]
    &lt;string name="giveup2"&gt;"CANCEL"&lt;/string&gt;
                           --------
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Here are the relevant source files:

`res/layout/buttonbar.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" &gt;

    &lt;!-- Hardcoded strings, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="OK" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Cancel" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Hardcoded strings, right order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Cancel" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="OK" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- @android:string resources, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@android:string/ok" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@android:string/cancel" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- @android:string resources, right order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@android:string/cancel" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@android:string/ok" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- @string/ok/cancel resources, right order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/cancel" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/ok" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- @string/ok/cancel resources, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/ok" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/cancel" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Random name resources, right order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/giveup" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/resume" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Random name resources, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/resume" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/giveup" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Random name resources with varying case, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/resume2" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/giveup2" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Resources with only one of OK and Cancel, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/ok" /&gt;

        &lt;Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/abort" /&gt;
    &lt;/LinearLayout&gt;

    &lt;!-- Resources with only one of OK and Cancel, wrong order --&gt;
    &lt;LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" &gt;

        &lt;Button
            android:layout_width="wrap_content" android:background="?android:attr/selectableItemBackground"
            android:layout_height="wrap_content"
            android:text="@string/send" /&gt;

        &lt;Button
            android:layout_width="wrap_content" android:background="?android:attr/selectableItemBackground"
            android:layout_height="wrap_content"
            android:text="@string/cancel" /&gt;
    &lt;/LinearLayout&gt;

    &lt;Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/goback" /&gt;

&lt;/LinearLayout&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

`res/values/buttonbar-values.xml`:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~xml linenumbers
&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;resources&gt;

    &lt;string name="button"&gt; Button &lt;/string&gt;
    &lt;string name="ok"&gt; OK &lt;/string&gt;
    &lt;string name="cancel"&gt; Cancel &lt;/string&gt;
    &lt;string name="resume"&gt; OK &lt;/string&gt;
    &lt;string name="giveup"&gt; Cancel &lt;/string&gt;
    &lt;string name="resume2"&gt; Ok &lt;/string&gt;
    &lt;string name="giveup2"&gt;"CANCEL"&lt;/string&gt;
    &lt;string name="send"&gt; Send &lt;/string&gt;
    &lt;string name="abort"&gt;Abort&lt;/string&gt;
    &lt;string name="goback"&gt;'Back'&lt;/string&gt;

&lt;/resources&gt;
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

You can also visit the
[source code](https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:lint/libs/lint-tests/src/test/java/com/android/tools/lint/checks/ButtonDetectorTest.java)
for the unit tests for this check to see additional scenarios.

The above example was automatically extracted from the first unit test
found for this lint check, `ButtonDetector.testCase`.
To report a problem with this extracted sample, visit
https://issuetracker.google.com/issues/new?component=192708.

(##) Suppressing

You can suppress false positives using one of the following mechanisms:

* Adding the suppression attribute `tools:ignore="ButtonCase"` on the
  problematic XML element (or one of its enclosing elements). You may
  also need to add the following namespace declaration on the root
  element in the XML file if it's not already there:
  `xmlns:tools="http://schemas.android.com/tools"`.

  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;resources xmlns:tools="http://schemas.android.com/tools"&gt;
      ...
      &lt;Button tools:ignore="ButtonCase" .../&gt;
    ...
  &lt;/resources&gt;
  ```

* Using a special `lint.xml` file in the source tree which turns off
  the check in that folder and any sub folder. A simple file might look
  like this:
  ```xml
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;lint&gt;
      &lt;issue id="ButtonCase" severity="ignore" /&gt;
  &lt;/lint&gt;
  ```
  Instead of `ignore` you can also change the severity here, for
  example from `error` to `warning`. You can find additional
  documentation on how to filter issues by path, regular expression and
  so on
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/lintxml.md.html).

* In Gradle projects, using the DSL syntax to configure lint. For
  example, you can use something like
  ```gradle
  lintOptions {
      disable 'ButtonCase'
  }
  ```
  In Android projects this should be nested inside an `android { }`
  block.

* For manual invocations of `lint`, using the `--ignore` flag:
  ```
  $ lint --ignore ButtonCase ...`
  ```

* Last, but not least, using baselines, as discussed
  [here](https://googlesamples.github.io/android-custom-lint-rules/usage/baselines.md.html).

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